blowing snow on parts of i-25, 70, 80 and 94. wet from the great lakes to the gulf coast, on i-10, 20 and 40. still slippery in arizona and new mexico. and slick on i-5, in northern california. >> and if you're flying today, you can expect some airport delays in denver, minneapolis, detroit, chicago, kansas city, memphis, houston and new orleans. and final preparations are now underway around the world to welcome in 2011. you are looking at new york's times square, where thousands of revelers will gather to watch the ball drop later on tonight. >> and there will be a heavy police presence there, as well, as you can imagine. aaron katersky reports on this big, annual tradition. >> three, two, one. happy new year. >> reporter: since 1907, its has been emblematic of new year's eve. the ball, dropped from extension, in times square. the first few new year's eve ball was iron and wood. today, it's waterford crystal.